Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[pandora-kernel.git] / net / mac80211 / michael.c

diff --git a/net/mac80211/michael.c b/net/mac80211/michael.c
index 0f844f7..408649b 100644 (file)
--- a/net/mac80211/michael.c
+++ b/net/mac80211/michael.c
@@ -6,85 +6,68 @@
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
-
 #include <linux/types.h>
+#include <linux/bitops.h>
+#include <linux/ieee80211.h>
+#include <asm/unaligned.h>
 
 #include "michael.h"
 
-static inline u32 rotr(u32 val, int bits)
-{
-       return (val >> bits) | (val << (32 - bits));
-}
-
-
-static inline u32 rotl(u32 val, int bits)
-{
-       return (val << bits) | (val >> (32 - bits));
-}
-
-
-static inline u32 xswap(u32 val)
-{
-       return ((val & 0xff00ff00) >> 8) | ((val & 0x00ff00ff) << 8);
-}
-
-
-#define michael_block(l, r) \
-do { \
-       r ^= rotl(l, 17); \
-       l += r; \
-       r ^= xswap(l); \
-       l += r; \
-       r ^= rotl(l, 3); \
-       l += r; \
-       r ^= rotr(l, 2); \
-       l += r; \
-} while (0)
-
-
-static inline u32 michael_get32(u8 *data)
+static void michael_block(struct michael_mic_ctx *mctx, u32 val)
 {
-       return data[0] | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
+       mctx->l ^= val;
+       mctx->r ^= rol32(mctx->l, 17);
+       mctx->l += mctx->r;
+       mctx->r ^= ((mctx->l & 0xff00ff00) >> 8) |
+                  ((mctx->l & 0x00ff00ff) << 8);
+       mctx->l += mctx->r;
+       mctx->r ^= rol32(mctx->l, 3);
+       mctx->l += mctx->r;
+       mctx->r ^= ror32(mctx->l, 2);
+       mctx->l += mctx->r;
 }
 
-
-static inline void michael_put32(u32 val, u8 *data)
+static void michael_mic_hdr(struct michael_mic_ctx *mctx, const u8 *key,
+                           struct ieee80211_hdr *hdr)
 {
-       data[0] = val & 0xff;
-       data[1] = (val >> 8) & 0xff;
-       data[2] = (val >> 16) & 0xff;
-       data[3] = (val >> 24) & 0xff;
+       u8 *da, *sa, tid;
+
+       da = ieee80211_get_DA(hdr);
+       sa = ieee80211_get_SA(hdr);
+       if (ieee80211_is_data_qos(hdr->frame_control))
+               tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
+       else
+               tid = 0;
+
+       mctx->l = get_unaligned_le32(key);
+       mctx->r = get_unaligned_le32(key + 4);
+
+       /*
+        * A pseudo header (DA, SA, Priority, 0, 0, 0) is used in Michael MIC
+        * calculation, but it is _not_ transmitted
+        */
+       michael_block(mctx, get_unaligned_le32(da));
+       michael_block(mctx, get_unaligned_le16(&da[4]) |
+                           (get_unaligned_le16(sa) << 16));
+       michael_block(mctx, get_unaligned_le32(&sa[2]));
+       michael_block(mctx, tid);
 }
 
-
-void michael_mic(u8 *key, u8 *da, u8 *sa, u8 priority,
-                u8 *data, size_t data_len, u8 *mic)
+void michael_mic(const u8 *key, struct ieee80211_hdr *hdr,
+                const u8 *data, size_t data_len, u8 *mic)
 {
-       u32 l, r, val;
+       u32 val;
        size_t block, blocks, left;
+       struct michael_mic_ctx mctx;
 
-       l = michael_get32(key);
-       r = michael_get32(key + 4);
-
-       /* A pseudo header (DA, SA, Priority, 0, 0, 0) is used in Michael MIC
-        * calculation, but it is _not_ transmitted */
-       l ^= michael_get32(da);
-       michael_block(l, r);
-       l ^= da[4] | (da[5] << 8) | (sa[0] << 16) | (sa[1] << 24);
-       michael_block(l, r);
-       l ^= michael_get32(&sa[2]);
-       michael_block(l, r);
-       l ^= priority;
-       michael_block(l, r);
+       michael_mic_hdr(&mctx, key, hdr);
 
        /* Real data */
        blocks = data_len / 4;
        left = data_len % 4;
 
-       for (block = 0; block < blocks; block++) {
-               l ^= michael_get32(&data[block * 4]);
-               michael_block(l, r);
-       }
+       for (block = 0; block < blocks; block++)
+               michael_block(&mctx, get_unaligned_le32(&data[block * 4]));
 
        /* Partial block of 0..3 bytes and padding: 0x5a + 4..7 zeros to make
         * total length a multiple of 4. */
@@ -94,11 +77,10 @@ void michael_mic(u8 *key, u8 *da, u8 *sa, u8 priority,
                left--;
                val |= data[blocks * 4 + left];
        }
-       l ^= val;
-       michael_block(l, r);
-       /* last block is zero, so l ^ 0 = l */
-       michael_block(l, r);
 
-       michael_put32(l, mic);
-       michael_put32(r, mic + 4);
+       michael_block(&mctx, val);
+       michael_block(&mctx, 0);
+
+       put_unaligned_le32(mctx.l, mic);
+       put_unaligned_le32(mctx.r, mic + 4);
 }